Fix some cleanup errors

Author: djowel

lib/include/elements/base_view.hpp

@@ -325,7 +325,7 @@ namespace cycfi { namespace elements
    };
 
    ////////////////////////////////////////////////////////////////////////////
-   inline void base_view::draw(cairo_t* /* ctx */, rect /* area */) {};
+   inline void base_view::draw(cairo_t* /* ctx */, rect /* area */) {}
    inline void base_view::click(mouse_button /* btn */) {}
    inline void base_view::drag(mouse_button /* btn */) {}
    inline void base_view::cursor(point /* p */, cursor_tracking /* status */) {}

lib/src/support/font.cpp

@@ -69,6 +69,13 @@ namespace cycfi { namespace elements
          return (a * (1.0 - f)) + (b * f);
       }
 
+#ifndef __APPLE__
+      auto const& cairo_user_data_key()
+      {
+         static const cairo_user_data_key_t key = {};
+         return key;
+      }
+#endif
       namespace fc
       {
          struct font_config_deleter